Steam Boilers, Engines, Nozzles and Turbines
The power of a boiler may be defined as

The evaporation of 15.653 kg of water per hour from and at 100° C
The amount of water evaporated from and at 100° C into dry and saturated steam
The amount of water evaporated or steam produced in kg per kg of fuel burnt
The ratio of heat actually used in producing the steam to the heat liberated in the furnace

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Steam Boilers, Engines, Nozzles and Turbines
Which is not the correct statement about moisture in coal?

Inherent moisture and surface moisture are different things
It increases thermal efficiency
Some moisture in coal helps in better burning which is not possible with completely dry coal
In some coals moisture may be present up to 40%

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